/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtpserver.handler.fastfail;

import org.apache.commons.logging.Log;
import org.springframework.beans.factory.annotation.Required;

import com.googlecode.asyncmail.common.DSNStatus;
import com.googlecode.asyncmail.common.MailAddress;
import com.googlecode.asyncmail.common.MailEnvelope;
import com.googlecode.asyncmail.smtp.SMTPRetCode;
import com.googlecode.asyncmail.smtpserver.SMTPSession;
import com.googlecode.asyncmail.smtpserver.hook.HookResult;
import com.googlecode.asyncmail.smtpserver.hook.HookReturnCode;
import com.googlecode.asyncmail.smtpserver.hook.RcptHook;

import java.util.List;

/**
 * 
 * This handler can be used to just ignore duplicated recipients.
 */
public class SupressDuplicateRcptHandler implements RcptHook {

    private Log logger;

    @Required
    public void setLogger(Log logger) {
        this.logger = logger;
    }

    public Log getLogger() {
        return logger;
    }

    /**
     * @see com.googlecode.asyncmail.smtpserver.hook.RcptHook#doRcpt(com.googlecode.asyncmail.smtpserver.SMTPSession,
     *      org.apache.mailet.MailAddress, org.apache.mailet.MailAddress)
     */
    public HookResult doRcpt(SMTPSession session, MailAddress sender,
            MailAddress rcpt) {
        List<MailAddress> rcptList = ((MailEnvelope) session.getState().get(
                SMTPSession.MAIL_ENVELOPE)).getRecipients();

        // Check if the recipient is allready in the rcpt list
        if (rcptList != null && rcptList.contains(rcpt)) {
            StringBuffer responseBuffer = new StringBuffer();

            responseBuffer.append(
                    DSNStatus.getStatus(DSNStatus.SUCCESS,
                            DSNStatus.ADDRESS_VALID)).append(" Recipient <")
                    .append(rcpt.toString()).append("> OK");
            getLogger().debug(
                    "Duplicate recipient not add to recipient list: "
                            + rcpt.toString());
            return new HookResult(HookReturnCode.OK, SMTPRetCode.MAIL_OK,
                    responseBuffer.toString());
        }
        return new HookResult(HookReturnCode.DECLINED);
    }

}
